1. Rotary table of rolling tooth worm gear pair
Worm gear pair transmission is widely used in mechanical industry. It has the characteristics of large transmission ratio, stable operation, no noise, compact structure, high bearing capacity and low efficiency. Improving the efficiency of worm gear pair, reducing temperature rise and improving wear resistance are the key to improve the use value of worm gear pair.
2. Direct drive motor drives rotary table
The rotary table driven by direct drive motor is composed of the rotary table body and its matching special servo drive device. It is driven by stepping motor and controlled by programmable controller. The main components of the rotary table driven by direct drive motor are: high-precision stepping motor, high-resolution optical encoder and hydraulic suspension bearing. The bearing used is a high rigid precision cross shaped hydraulic suspension bearing that can bear the load in any direction.
This kind of mechanism has high driving precision and sensitive response. At present, some rotary worktables with high precision at home and abroad adopt this driving mode. However, in order to ensure the torque required for high-power cutting at low speed when the high-power cutting force acts on this motor direct drive structure, high-power motors are often configured, so that the whole structure of the rotary table is larger.
3. The servo motor drives the gear bar pair rotary workbench
The servo motor drives the rack and pinion auxiliary rotary workbench, and the servo motor drives the gear 1 to rotate. The gear 1 drives the rack to make a linear motion, and then the rack drives the gear 2 to rotate, thereby driving the rotation of the workbench. The advantage of this structure is that the servo motor drive response is sensitive, but the self-locking performance is poor, and there are problems such as automatic gap compensation and moment of inertia.
4. Double motor driven worm gear pair rotary workbench
The double motor drive worm gear pair is characterized by using the spindle servo motor as the transmission motor, and the main motor as the transmission motor, and the auxiliary motor as the reverse transmission and reverse torque motor; The self-locking function of worm gear is used to distinguish the main and auxiliary drives, and to eliminate the reverse drive clearance; The transmission speed of the auxiliary motor is greater than that of the main motor. Its disadvantage is that it doesn't get rid of the worm and gear, and it can't solve the problem of heat and wear of the worm and gear in high-speed machining.